Nexperia
BCX51-Q series
45 V, 1 A PNP medium power transistors
9. Thermal characteristics
Table 6. Thermal characteristics
Tamb = 25 °C unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
250
132
93
Unit
K/W
K/W
K/W
K/W
Rth(j-a)
thermal resistance from junction to ambient
in free air
[1]
[2]
[3]
-
-
-
-
-
-
-
-
R(j-sp)
thermal resistance from junction to solder point
16
[1] Device mounted on an FR4 PCB; single-sided copper; tin-plated and standard footprint.
[2] Device mounted on an FR4 PCB; single-sided copper; tin-plated; mounting pad for collector 1 cm2.
[3] Device mounted on an FR4 PCB; single-sided copper; tin-plated; mounting pad for collector 6 cm2.
006aac680
3
10
Z
th(j-a)
(K/W)
duty cycle = 1
0.75
0.5
2
10
0.33
0.2
0.1
0.05
0.02
10
0.01
1
0
- 1
10
- 5
- 4
- 3
10
- 2
- 1
2
3
10
10
10
10
1
10
10
10
t
(s)
p
FR4 PCB; single-sided copper; tin-plated and standard footprint
Fig. 2. Transient thermal impedance from junction to ambient as a function of pulse duration; typical values
006aac681
3
10
Z
th(j-a)
(K/W)
duty cycle = 1
2
10
0.75
0.5
0.33
0.2
0.1
10
0.05
0.02
0.01
0
1
- 1
10
- 5
- 4
- 3
10
- 2
- 1
2
3
10
10
10
10
1
10
10
10
t
(s)
p
FR4 PCB; single-sided copper; tin-plated; mounting pad for collector 1 cm2
Fig. 3. Transient thermal impedance from junction to ambient as a function of pulse duration; typical values
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BCX51-Q_SER
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Nexperia B.V. 2023. All rights reserved
Product data sheet
Rev. 1 — 16 October 2023
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